On-Orbit SNR Evaluation of Polarized Scanning Atmospheric Corrector Onboard HJ-2 Satellites

Hao Dong; Zhenhai Liu; Xinxin Zhao; Xuefeng Lei; Fei Tao; Yuheng Chu; Peng Zou; Maoxin Song; Qiang Cong; Jin Hong

doi:10.3788/AOS202242.2401005

Acta Optica Sinica, Volume. 42, Issue 24, 2401005(2022)

On-Orbit SNR Evaluation of Polarized Scanning Atmospheric Corrector Onboard HJ-2 Satellites

Hao Dong^1,2,3, Zhenhai Liu^1,3、*, Xinxin Zhao^1,2,3, Xuefeng Lei^1,2,3, Fei Tao^1,3, Yuheng Chu^1,3, Peng Zou^1,3, Maoxin Song^1,3, Qiang Cong⁴, and Jin Hong^1,3

Author Affiliations

¹Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui , China

²University of Science and Technology of China, Hefei 230027, Anhui , China

³Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei 230031, Anhui , China

⁴DFH Satellite Co., Ltd., Beijing 100094, China

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Figures & Tables(14)

Fig. 1. PSAC main structure^[23]

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Fig. 2. Schematic of PSAC scanning observation

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Fig. 3. Radiation calibrator structure diagram. (a) Solar diffuser; (b) calibrator module

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Fig. 4. Photo of model parameter acquisition in laboratory

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Fig. 5. Signal-total noise power linear fitting curves. (a) 865 nm band; (b) 1610 nm band

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Fig. 6. PSAC on-orbit SNRs evaluation results under different radiances

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Fig. 7. Solar diffuser sampling points response in a single scanning

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Fig. 8. Multiple observation solar diffuser responses of one sampling point and fitting residuals. (a) 865 nm band; (b) 1610 nm band

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Fig. 9. Comparison of two SNR conversion results. (a) 443 nm band; (b) 555 nm band

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Fig. 10. SNR estimation error caused by $C_{0}$ change

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Table 1. Main specifications of PSAC

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Table 1. Main specifications of PSAC

Parameter	Value
Swath /km	≥800
Instantaneous field-of-view（IFOV）/（°）	0.52
Resolution at nadir /km	≤6@645 km
Band /nm	410，443，555，670，865，910，1380，1610，2250
Polarization detection angle /（°）	0，45，90，135
Effective quantization bits /bit	15
Signal-to-noise ratio（SNR）/dB	41-45@L_t_yp
Average dark counts for all channels /DN	［-30，30］
Radiometric calibration accuracy /%	≤5
Polarimetric calibration accuracy /%	≤0.5 （P<0.3）

Table 2. Performance parameters of integrating sphere
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Table 2. Performance parameters of integrating sphere
Parameter Value
Band range /nm 350-2500
Opening diameter /mm 120
Stability /（%·h^-1） 0.2

Table 3. Evaluation results of PSAC SNRs under typical radiance

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Table 3. Evaluation results of PSAC SNRs under typical radiance

Band /nm	Typical radiance $L_{t y p}$ /（W·m^-2·μm^-1·sr^-1）	Absolute radiation response coefficient $C_{0}$ /（W·m^-2·μm^-1·sr^-1）	SNR specification $R_{S N s p e}$ /dB	SNR calculated by model $R_{S N d B}$ /dB
443	387.9	8.00×10^-3	45	69.94
555	371.5	8.14×10^-3	45	72.07
670	293.4	6.07×10^-3	45	71.21
865	187.2	3.95×10^-3	45	74.92
1610	45.4	9.39×10^-4	45	75.19

Table 4. Comparison of results of two SNR evaluation methods

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Table 4. Comparison of results of two SNR evaluation methods

Band /nm	Model parameter $A$	Dark noise power $σ_{d a r k}^{2}$	Mean value of solar diffuser response $\bar{D}$	Total noise power based on model $σ_{t o t a l}^{2}$	Total noise power based on solar diffuser $σ_{t o t a l, S D}^{2}$	SNR based on model	SNR based on solar diffuser	Relative deviation /%
443	1.34×10^-3	26.99	21567	55.89	55.21	2884.84	2902.56	-0.62
555	7.92×10^-4	14.27	23443	32.82	35.07	4092.07	3958.73	3.36
670	7.64×10^-4	25.65	25033	44.77	47.54	3741.27	3630.64	3.03
865	5.36×10^-4	5.41	22557	17.49	18.83	5393.69	5197.96	3.75
1610	6.41×10^-4	2.16	21107	15.68	17.72	5330.32	5014.12	6.27

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Hao Dong, Zhenhai Liu, Xinxin Zhao, Xuefeng Lei, Fei Tao, Yuheng Chu, Peng Zou, Maoxin Song, Qiang Cong, Jin Hong. On-Orbit SNR Evaluation of Polarized Scanning Atmospheric Corrector Onboard HJ-2 Satellites[J]. Acta Optica Sinica, 2022, 42(24): 2401005

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